Terry J. Reedy <[email protected]> added the comment:
I switched to patch review because I am not sure unit test is possible.
I did not advocate a change to immediate execution in my original post. I noted
that pasting multiple statements does not work and that if it cannot be made to
work, the limitation should be documented. I am fine with pasting working the
same as when one copies a previous statement to the current input prompt with
<cursor on line>+Enter.
Issue #9618 elaborated "<statement>\n<statement> does not work" by pointing out
that <simple statement>\n<simplestatement> silently ignores the second while
<compoundstatement>\n<simplestatement> is reported as a syntax error. I pointed
out that if <compoundstatement> does not end in \n, it really is a syntax
errror for interactive mode, but even with \n\n, it still is reported as such
when it is not.
So a possible revised minimal request is that an initial compound statement be
executed and the rest ignored. However ....
I have discover that the elaboration is not exactly true either. msg114019 says
"If you manage to type several simple statements into the prompt (by
copy-pasting them, using Ctrl+J, or creative deletion), IDLE runs the first one
and silently ignores the rest:" However, when I edit 'for x in []:' to 'x = 3'
*after* adding ' y = 7' I get with 3.1:
>>> x
2
>>> y
4
>>> x = 3
y = 7
>>> x
3
>>> 7
7
Somehow, both statements are executed because of the indent! This might be
considered a bug as the indent should be a syntax error. Without it, the second
line is ignored, as reported.
The significant difference between the (Windows) interactive interpreter and
IDLE is that the II is *line* oriented* while IDLE is *statement* oriented.
With II, entry (and history) is by single lines. A line entered cannot be
edited and history (up/down arrow) copies a single previous line. Multiline
compound statements require *manual* indentation. Rerunning (and editing) a
multiline compound statement requires rerunning (and editing) each line one at
a time. IDLE, allows multiline editing before the double Enter (hence the
shenanigans above, impossible with II), does auto indents, and retrieves and
allows editing of entire multiline statements with <cursor>+Enter.
Since the IDLE Shell operates differently from the II, it cannot and should not
imitate II paste behavior. It seems to treat pasted code more-or-less the same
as edited code from the keyboard, which it expects to be a statement,
single-line multi-statment, or compound statement. If there is a problem, I
think perhaps it is in how it handles abusively edited multiline statements.
Perhaps it should always raise SyntaxError instead of silently ignoring part of
the entry.
----------
stage: unit test needed -> patch review
versions: +Python 3.2
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